13
Aluminum 13,
Gives soda cans their sheen
Soda cans are made of the metal Aluminum.
"Metallic sheen" is a common phrase.

14
Silicon
14,
Glass and thinking machineSilicon is used in glass and computer chips.

15
Phosphorus 15,
Grass and crops grow greenPhosphorus is used as a fertilizer.
"Grass" rhymes with "Glass" in the previous verse.

16
Sulfur 16,
Not sweet it smells obscene"Sweet 16" is a common expression. Sulfur smells like rotten eggs.

17
Chlorine 17,
The smell of swimming pool cleanChlorine is used to disinfect swimming pools. It has a strong smell when
too much chlorine is added to the pool. The word "smell" ties to "smells"
in the previous verse.

18
Argon 18,
The king of doing nothingArgon is a non-reactive noble gas.

26
Iron
26,
To rusty nails a magnet sticks
Rust
is hydrated iron oxide; iron is
ferromagnetic.
To relate this to the previous two verses, a rusty nail can hang a framed
painting which would improve decor.